CN114673599B

CN114673599B - Control method, control device and processor for parking regeneration of particle catcher

Info

Publication number: CN114673599B
Application number: CN202210404081.6A
Authority: CN
Inventors: 安泽伟; 王桂洋; 陈国栋; 狐晓斌; 康洪升; 王健强; 王建勇; 张广军; 闫朝亮; 赵弘志
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2023-04-28
Anticipated expiration: 2042-04-18
Also published as: CN114673599A

Abstract

The invention discloses a control method, a control device and a processor for parking and regenerating a particle catcher. Wherein the method comprises the following steps: collecting a first temperature sensed by a sensor of the particle trap; judging whether the particle catcher meets a post-combustion condition according to the first temperature; under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result; generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the engine, an rich strategy that increases fuel to the engine. The invention solves the technical problems of high noise and overhigh local temperature in the engine cabin caused by overhigh engine speed.

Description

Control method, control device and processor for parking regeneration of particle catcher

Technical Field

The invention relates to the field of automobile exhaust treatment, in particular to a control method, a control device and a processor for parking and regenerating a particle catcher.

Background

GPF (gasoline particulate filter), namely the gasoline engine particle catcher, is mainly applied to a direct injection (gasolinedirect injection, GDI) gasoline engine in a cylinder, and aims to reduce the emission of particles of the gasoline engine to meet the stricter and stricter regulation requirements. The GPF is of a wall flow type structure, and the purpose of removing soot is achieved by trapping soot particles in exhaust gas on a wall surface, but the continuous accumulation of soot particles can cause the GPF to be blocked, so that the problems of exhaust back pressure rise, engine fuel economy deterioration and the like are caused. To restore the filtration function of the GPF, periodic regeneration of the soot particulate laden GPF is required. When the carbon load in the GPF reaches the set regeneration limit value, an active regeneration strategy for actively changing the operation parameters of the engine is adopted or the engine is parked and regenerated to a 4S shop, so that the particles in the GPF are rapidly oxidized, and the purpose of removing the particles in the GPF is achieved.

Some car owners cannot meet the conditions of long-time high-speed operation and the like in actual use, GPF cannot realize active regeneration, and after GPF is blocked, parking regeneration is required to be carried out in a 4S shop. At present, the traditional parking regeneration mode is as follows: under the condition of stopping idling, the engine speed is increased, the ignition angle is reduced to increase the GPF temperature, and then the oxygen flow is increased by reducing the air-fuel ratio of the engine, so that carbon deposition in the GPF is combusted until the carbon deposition combustion is finished.

In the above-mentioned conventional way of parking regeneration, it is sometimes necessary to raise the engine speed to a higher speed, and during the parking regeneration, not only a large noise is generated, but also the temperature of the parts such as the inside of the engine and the supercharger is high; the local overhigh temperature in the engine compartment has a great risk, and a high-power fan is usually required to be arranged in front of the vehicle to cool the vehicle, which increases the difficulty of parking and regeneration.

Disclosure of Invention

The embodiment of the invention provides a control method, a control device and a processor for parking and regenerating a particle catcher, which are used for at least solving the technical problems of loud noise and overhigh local temperature in an engine cabin caused by overhigh engine rotation speed.

According to an aspect of the embodiment of the present invention, there is provided a control method for parking and regenerating a particulate trap, including: collecting a first temperature sensed by a sensor of the particle trap; judging whether the particle catcher meets a post-combustion condition according to the first temperature; under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result; generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the engine, an rich strategy that increases fuel to the engine.

Optionally, a control instruction set is generated based on the comparison result, the control instruction set being used to control the engine to execute the regeneration strategy, including: generating a first target control instruction in a control instruction set under the condition that the comparison result meets a first preset condition, wherein the first target control instruction is used for controlling the engine to execute a lean strategy so as to adjust the air-fuel ratio of the engine to a first target air-fuel ratio; collecting a first air-fuel ratio and a second air-fuel ratio, wherein the first air-fuel ratio is the air-fuel ratio in a communicating pipeline between the catalyst and the engine, and the second air-fuel ratio is the air-fuel ratio in the communicating pipeline between the catalyst and the particle catcher; the engine stop lean strategy is controlled in a case where it is determined that both the first air-fuel ratio and the second air-fuel ratio are equal to the first target air-fuel ratio, and the duration of the first air-fuel ratio and the second air-fuel ratio maintained at the first target air-fuel ratio satisfies a first preset duration.

Optionally, a control instruction set is generated based on the comparison result, the control instruction set being used to control the engine to execute the regeneration strategy, including: generating a second target control instruction in the control instruction set under the condition that the comparison result meets a second preset condition, wherein the second target control instruction is used for controlling the engine to execute a enrichment strategy so as to adjust the air-fuel ratio of the engine to a second target air-fuel ratio; collecting a second temperature of the particle trap; and controlling the engine to stop the enrichment strategy under the condition that the second temperature is determined to be greater than or equal to a regeneration temperature threshold, wherein the regeneration temperature threshold is a temperature value required for carbon deposit combustion in the particle trap.

Optionally, the control method includes: judging whether the temperature of the particle catcher collected at the first moment and the temperature of the particle catcher collected at the second moment meet a third preset condition or not under the condition that the second temperature is smaller than a regeneration temperature threshold value, wherein the first moment is positioned before the second moment; if so, the engine is controlled to execute a lean-burn strategy to adjust the air-fuel ratio of the engine to a third target air-fuel ratio.

Optionally, the control method includes: judging whether the duration of executing the enrichment strategy by the engine at the second target air-fuel ratio meets a fourth preset condition under the condition that the second temperature is smaller than a regeneration temperature threshold value; if so, the engine is controlled to execute a lean-burn strategy to adjust the air-fuel ratio of the engine to a third target air-fuel ratio.

Optionally, the control method includes: in controlling the engine to execute the lean strategy at the third target air-fuel ratio, generating a third target control instruction in the control instruction set under the condition that the second temperature is smaller than the regeneration temperature threshold value, wherein the third target control instruction is used for controlling the engine to execute the rich strategy.

Optionally, the control method includes: in the process of controlling the engine to execute the lean strategy at the third target air-fuel ratio, controlling the engine to execute the lean strategy to adjust the air-fuel ratio of the engine to the fourth target air-fuel ratio in the case where the second temperature is greater than or equal to the regeneration temperature threshold; and detecting the carbon load in the particle trap, and controlling the engine to execute an enrichment strategy under the condition that the carbon load is higher than a carbon amount allowable value and the second temperature of the current particle trap is smaller than a second temperature threshold value.

Optionally, during control of the engine to implement the lean-burn strategy, the spark advance of the engine is adjusted to increase the temperature within the particulate trap.

According to another aspect of the embodiment of the present invention, there is also provided a control device for parking and regenerating a particulate trap, including: the acquisition module is used for acquiring a first temperature of the particle catcher sensed by the sensor; the comparison module is used for judging whether the particle catcher meets the post-combustion condition according to the first temperature; under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result; the generation module is used for generating a control instruction set based on the comparison result, wherein the control instruction set is used for controlling the engine to execute a regeneration strategy, and the regeneration strategy comprises at least one of the following steps: an lean strategy that increases oxygen flow to the engine, an rich strategy that increases fuel to the engine.

According to another aspect of the embodiments of the present invention, there is also provided a computer storage medium, the computer storage medium including a stored program, wherein when the program runs, a device on which the computer storage medium is controlled to execute the control method according to any one of the above schemes.

According to another aspect of the embodiments of the present invention, there is also provided a processor for running a program, the processor being arranged to run a computer program to perform the control method of any of the above aspects.

In the embodiment of the invention, after the particle catcher is determined to reach the post-combustion condition according to the first temperature, the first temperature is further compared with a first temperature threshold value, and a control instruction set is generated according to a comparison result, wherein the control instruction set controls the engine to execute the thinning strategy and the enrichment strategy. Regeneration of the particle trap refers to burning carbon deposits on the walls of the particle trap, which requires the combustion temperature of the carbon deposits to be reached within the particle trap. After the first temperature reaches the post-combustion condition, the engine is controlled to increase oxygen flow to the particle catcher and increase fuel to the engine, namely the air-fuel ratio of the engine is in an oscillation state, the fuel which is not fully combusted in the engine flows into the particle catcher, and under the condition that the first temperature and the oxygen meet the combustion condition, the fuel which is not fully combusted is subjected to secondary combustion in the particle catcher so as to further increase the temperature in the particle catcher. In the air-fuel ratio process of the engine continuously switching, the particle catcher continuously heats up until the temperature in the particle catcher reaches the carbon deposition combustion temperature. The regeneration mode only needs to increase the rotating speed of the engine to the rotating speed which meets the post-combustion condition, and the rotating speed of the engine does not need to be increased to 2000-3000 revolutions or even higher, so that the technical problems that the engine generates larger noise and the parts are damaged due to the overhigh local temperature in the engine cabin are avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a block diagram of an electronic device for a vehicle with an alternative method for controlling park regeneration of a particulate trap in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of an alternative method of controlling a park regeneration of a particulate trap in accordance with an embodiment of the present invention;

FIG. 3 is a block diagram of a hardware system for park regeneration of a particulate trap;

FIG. 4 is a flow chart of an alternative method of controlling a park regeneration of a particulate trap in accordance with an embodiment of the present invention;

fig. 5 is a block diagram of an alternative control device for park regeneration of a particulate trap in accordance with an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

According to an embodiment of the present invention, there is provided an embodiment of a method of controlling the park regeneration of a particulate trap, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than what is shown or described herein.

The method embodiments may be performed in an electronic device or similar computing device in a vehicle that includes a memory and a processor. Taking an example of operation on an electronic device of a vehicle, as shown in fig. 1, the electronic device of the vehicle may include one or more processors 102 (the processors may include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processor (GPU), a Digital Signal Processing (DSP) chip, a Microprocessor (MCU), a programmable logic device (FPGA), a neural Network Processor (NPU), a Tensor Processor (TPU), an Artificial Intelligence (AI) type processor, etc., and a memory 104 for storing data. Optionally, the electronic apparatus of the automobile may further include a transmission device 106, an input/output device 108, and a display device 110 for communication functions. It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device of the vehicle described above. For example, the electronic device of the vehicle may also include more or fewer components than the above structural description, or have a different configuration than the above structural description.

The memory 104 may be used to store a computer program, for example, a software program of an application software and a module, such as a computer program corresponding to a control method of parking and regenerating a particle trap in an embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the control method of the hydrogen direct injection system described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission means 106 is arranged to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used to communicate with the internet wirelessly.

The display device 110 may be, for example, a touch screen type Liquid Crystal Display (LCD) and a touch display (also referred to as a "touch screen" or "touch display"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI), and the user may interact with the GUI by touching finger contacts and/or gestures on the touch-sensitive surface, where the man-machine interaction functions optionally include the following interactions: executable instructions for performing the above-described human-machine interaction functions, such as creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving electronic mail, talking interfaces, playing digital video, playing digital music, and/or web browsing, are configured/stored in a computer program product or readable storage medium executable by one or more processors.

In this embodiment, a control method for parking and regenerating the particulate trap is provided, and fig. 2 is a flowchart of a control method for parking and regenerating the particulate trap according to one embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps: step S1: a first temperature of the particle trap sensed by a sensor is collected. Step S2: and judging whether the particle catcher meets the post-combustion condition according to the first temperature. And under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result. Step S3: generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the particulate trap, an rich strategy that increases fuel to the engine. The first temperature may be an inlet temperature of the particle trap or an internal temperature of the particle trap, and the specific value of the first temperature threshold is determined by parameters of the engine or carbon deposition amount on the wall surface of the particle trap.

The post-combustion in step S2 means that the air-fuel ratio of the engine is controlled so that the fuel which is not fully combusted in the engine enters the catalyst and the particle trap, and the fuel which is not fully combusted undergoes an oxidation-reduction reaction with oxygen stored in the catalyst and the particle trap at a certain temperature, thereby releasing a large amount of heat.

In an embodiment of the present application, after the particulate trap is determined to reach the post-combustion condition according to the first temperature, the first temperature is further compared with a first temperature threshold, and a control instruction set is generated according to a comparison result, wherein the control instruction set controls the engine to execute the lean strategy and the rich strategy. Regeneration of the particle trap refers to burning carbon deposits on the walls of the particle trap, which requires the combustion temperature of the carbon deposits to be reached within the particle trap. After the first temperature reaches the post-combustion condition, the engine is controlled to increase oxygen flow to the particle catcher and increase fuel to the engine, namely the air-fuel ratio of the engine is in an oscillation state, the fuel which is not fully combusted in the engine flows into the particle catcher, and under the condition that the first temperature and the oxygen meet the combustion condition, the fuel which is not fully combusted is subjected to secondary combustion in the particle catcher so as to further increase the temperature in the particle catcher. In the air-fuel ratio process of the engine continuously switching, the particle catcher continuously heats up until the temperature in the particle catcher reaches the carbon deposition combustion temperature. The regeneration mode only needs to increase the rotating speed of the engine to the rotating speed which meets the post-combustion condition, and the rotating speed of the engine does not need to be increased to 2000-3000 revolutions or even higher, so that the technical problems that the engine generates larger noise and the parts are damaged due to the overhigh local temperature in the engine cabin are avoided.

Optionally, in step S3, in a case where the comparison result satisfies the first preset condition, a first target control instruction in the control instruction set is generated, where the first target control instruction is used to control the engine to execute the lean strategy so as to adjust the air-fuel ratio of the engine to the first target air-fuel ratio. A first air-fuel ratio is acquired, which is an air-fuel ratio in a communicating pipe between the catalyst and the engine, and a second air-fuel ratio is an air-fuel ratio in a communicating pipe between the catalyst and the particulate trap. And controlling the engine to stop the lean strategy under the condition that the first air-fuel ratio and the second air-fuel ratio are equal to the first target air-fuel ratio and the duration of the first air-fuel ratio and the second air-fuel ratio maintained at the first target air-fuel ratio meets the first preset duration. In the above steps, an abatement strategy is performed, i.e., increasing the oxygen flow into the engine, unburned oxygen will flow into the particulate trap, providing sufficient oxygen for post combustion.

It should be noted that the first preset condition refers to that the first temperature of the particle catcher is greater than or equal to the post-combustion temperature. The first target command directs the engine to execute an abatement strategy with the objective of increasing oxygen flow into the particulate trap to provide sufficient oxygen for post combustion. When both the first air-fuel ratio and the second air-fuel ratio are equal to the first target air-fuel ratio, it may be preliminarily determined that the inside of the particulate trap is completely oxygenated. The duration of the first air-fuel ratio and the second air-fuel ratio maintained at the first target air-fuel ratio satisfies the first preset duration, and unstable flow is avoided from being completely oxygenated. The first preset duration may be any duration that meets the actual working condition.

Optionally, in step S3, in a case where the comparison result satisfies a second preset condition, a second target control instruction in the control instruction set is generated, where the second target control instruction is used to control the engine to execute the enrichment strategy so as to adjust the air-fuel ratio of the engine to a second target air-fuel ratio. A second temperature of the particle trap is collected. And controlling the engine to stop the enrichment strategy under the condition that the second temperature is determined to be greater than or equal to a regeneration temperature threshold, wherein the regeneration temperature threshold is a temperature value required for carbon deposit combustion in the particle trap. In the above step, an enrichment strategy is performed, i.e., fuel is added to the engine, unburned fuel flows into the particle trap, and post combustion occurs in the particle trap.

It should be noted that the second preset condition refers to that the first temperature of the particle catcher is greater than or equal to the post-combustion temperature. The second temperature may be an inlet temperature of the particle trap or a temperature inside the particle trap.

Optionally, under the condition that the second temperature is smaller than the regeneration temperature threshold, judging whether the temperature of the particle catcher collected at the first moment and the temperature of the particle catcher collected at the second moment meet a third preset condition, wherein the first moment is located before the second moment. If so, the engine is controlled to execute a lean-burn strategy to adjust the air-fuel ratio of the engine to a third target air-fuel ratio.

The third preset condition refers to: the temperature of the particle catcher collected at the second moment is smaller than that of the particle catcher collected at the first moment. In the above step, the satisfaction of the third preset condition indicates that the temperature in the particle trap starts to decrease, i.e., that combustion is not occurring in the particle trap. By increasing the oxygen flow within the particle trap, unburned fuel continues to burn, allowing the particle trap to continue to warm.

Optionally, in the case where the second temperature is less than the regeneration temperature threshold, it is determined whether the duration of time for which the engine executes the rich spike at the second target air-fuel ratio satisfies a fourth preset condition. If so, the engine is controlled to execute the lean strategy to adjust the air-fuel ratio of the engine to a third target air-fuel ratio.

It should be noted that the fourth preset condition refers to that the duration of the engine executing the enrichment strategy with the second target air-fuel ratio is longer than the second preset duration, the second preset duration is determined by the second temperature, and the second different temperatures correspond to the second different preset durations, and after exceeding the second preset duration, the temperature is reduced or the oxidation reaction is weakened. In the above step, the oxygen flow in the particle catcher is increased to increase the intensity of the oxidation reaction, so that the particle catcher is continuously heated.

Optionally, in controlling the engine to execute the lean strategy at the third target air-fuel ratio, if the second temperature is smaller than the regeneration temperature threshold, a third target control instruction in a control instruction set is generated, wherein the third target control instruction is used for controlling the engine to execute the rich strategy. In the above steps, it is explained that the fuel in the particle trap has burned out, and it is necessary to increase the fuel in the particle trap so that the particle trap continues to warm up.

Optionally, in controlling the engine to execute the lean-burn strategy at the third target air-fuel ratio, the engine is controlled to execute the lean-burn strategy to adjust the air-fuel ratio of the engine to the fourth target air-fuel ratio in the case where the second temperature is greater than or equal to the regeneration temperature threshold. And detecting the carbon loading in the particle catcher, and controlling the engine to execute an enrichment strategy under the condition that the carbon loading is higher than a carbon loading allowable value and the second temperature of the current particle catcher is smaller than a second temperature threshold value. The second temperature threshold is determined by the carbon loading of the particle trap, and different carbon loading corresponds to different second temperature thresholds. In the above step, a carbon load higher than the allowable value of the carbon amount indicates that the stop regeneration of the particle trap is not completed, and a second temperature of the current particle trap lower than the second temperature threshold value indicates that the rate of soot combustion starts to be slow, namely that the temperature raising operation of the particle trap needs to be continued.

Optionally, during control of the engine to implement the lean-burn strategy, the spark advance of the engine is adjusted to increase the temperature within the particulate trap. In the steps, the ignition advance angle of the engine is adjusted to assist the temperature rise of the particle trap, so that the rate of carbon deposition combustion can be further improved.

The embodiment of the application also provides a hardware system for parking and regenerating a particle catcher, fig. 3 is a block diagram of the hardware system for parking and regenerating a particle catcher, as shown in fig. 3, and the system includes: an engine, a catalyst (TWC), a particulate trap (GPF), an Electronic Control Unit (ECU), an oxygen sensor, and a temperature sensor. The engine, the catalyst and the particle catcher are sequentially connected in series through a connecting pipeline, an oxygen sensor is arranged in the connecting pipeline between the catalyst and the engine, an oxygen sensor is also arranged in the connecting pipeline between the catalyst and the particle catcher, and a temperature sensor is arranged at the inlet of the particle catcher. The oxygen sensor is used for detecting the air-fuel ratio in the communication pipeline, and the temperature sensor is used for detecting the temperature at the inlet of the particle catcher. Wherein λ1 is the air-fuel ratio in the communicating pipe between the engine and the catalyst, λ2 is the air-fuel ratio in the communicating pipe between the catalyst and the particle catcher, and T is the temperature at the inlet of the particle catcher. The electronic control unit is used for receiving the engine signal parameter, the oxygen sensor signal parameter, the temperature sensor signal parameter and sending the engine control parameter.

Fig. 4 is a control flowchart of a method for controlling a parking regeneration of a particulate trap according to an alternative embodiment of the present application, as shown in fig. 4, the flowchart includes the steps of:

step S10: reading parameters, activating regeneration: and acquiring relevant parameters of the engine and carbon deposition C in the particle catcher, and when the carbon deposition C is larger than the preset carbon deposition C0, confirming that the engine state allows regeneration, and activating a parking regeneration program through the OBD diagnostic instrument.

Step S20: preheating: the engine speed is raised to N and the ignition angle is deactivated, and the air-fuel ratio is normal (control λ1=1). When T is not less than T1, the internal temperature of the catalyst and the particle catcher reaches the post-combustion condition, and the process proceeds to step S30. The difficulty level of post combustion is related to the exhaust gas amount (M) of the engine, different values of T1 and T1 are set according to different exhaust gas amounts, and the values are obtained by looking up table 1.

TABLE 1

M (exhaust volume)	M1	M2	M3	M4
					T1	Temperature 1	Temperature 2	Temperature 3	Temperature 4

Step S30: preliminary oxygenation: the target air-fuel ratio is thinned to L1 (e.g., l1=1.05), when λ1=λ2=l1, and after a delay of t1 (e.g., t1=3 seconds), this indicates that the catalyst and the interior of the particulate trap are fully oxygenated. Wherein t1 corresponds to the first preset time period in the above embodiment.

Step S40: and (3) quick enrichment: the target air-fuel ratio is enriched to L2, L2 is determined by T, and L2 is obtained by looking up table 2 due to different oxygen storage amounts and oxidation-reduction reaction rates in the catalyst and the particle trap at different temperatures.

TABLE 2

T(℃)

550 or less

550～600

600～650

650～700

700～750

750～800

800 or more

L2

Air-fuel ratio 1

Air-fuel ratio 2

Air-fuel ratio 3

Air-fuel ratio 4

Air-fuel ratio 5

Air-fuel ratio 6

Air-fuel ratio 7

On the basis of step S40, when the condition 1 or the condition 2 is satisfied, the process proceeds to step S50. Condition 1 is: t < T2, and T (current time) < T (100 ms ago), i.e., the temperature of T starts to drop and the oxidation-reduction reaction becomes weak. Condition 2 is: and T < T2, and the enrichment time is equal to or longer than a threshold T2 (corresponding to the second preset time length in the embodiment). Wherein T2 is determined by the temperature T, and after the temperature exceeds the time T2, the enrichment temperature is reduced or the oxidation reaction is weakened, and T2 is obtained by checking 3.

TABLE 3 Table 3

T(℃)

550 or less

550～600

600～650

650～700

700～750

750～800

800 or more

t2

Time 1

Time 2

Time 3

Time 4

Time 5

Time 6

Time 7

Upon satisfaction of the condition 3, the process proceeds to step S70 on the basis of step S40. Condition 3 is: T.gtoreq.T2, which means that the temperature in the particle trap has met the regeneration conditions, the carbon burn can begin. Wherein T2 is determined by the carbon content C, and T2 is obtained by looking up 4. And when the carbon content is high, the lower temperature is adopted, so that the particle catcher is prevented from being burnt due to severe local temperature rise caused by rapid carbon burning. And when the carbon content is low, the higher temperature is adopted, the carbon burning rate is increased, and the time for parking and regenerating is reduced.

TABLE 4 Table 4

C(g)

0～4

4～8

8～12

12～15

15～18

18 or more

T2(℃)

Temperature 1

Temperature 2

Temperature 3

Temperature 4

Temperature 5

Temperature 6

Step S50: the target air-fuel ratio is enriched to L3 by rapid lean, L3 is determined by T, and L3 is obtained by looking up table 4 due to different oxygen storage amounts and oxidation-reduction reaction rates in the catalyst and the GPF at different temperatures.

TABLE 5

T(℃)

550 or less

550～600

600～650

650～700

700～750

750～800

800 or more

L3

Air-fuel ratio 1

Air-fuel ratio 2

Air-fuel ratio 3

Air-fuel ratio 4

Air-fuel ratio 5

Air-fuel ratio 6

Air-fuel ratio 7

On the basis of step S50, when condition 4 is satisfied, the process returns to step S40. Condition 4 is: λ1=λ2=l3 and T < T2, which means that the particle trap is completely full of oxygen, the hydrocarbon is completely burned, the oxidation reaction does not increase in temperature after the continuous dilution, and step 40 is performed after a delay time T3 (e.g., t=1 second).

On the basis of step S50, when condition 5 is satisfied, the process proceeds to step S60. Condition 5 is: T.gtoreq.T2, which means that the temperature in GPF has met the regeneration conditions, the carbon burn operation can be started.

And (5) reciprocating the steps S40 and S50 until T is more than or equal to T2, and entering the step S60.

Step S60: thinning and burning carbon: the target air-fuel ratio is controlled to be L4 so that oxygen enters the particulate trap and carbon deposition is performed at a high temperature. In this condition, the misfire angle may still be selected to assist in maintaining or increasing the exhaust temperature.

Upon satisfaction of the condition 6, the process proceeds to step S70 on the basis of step S60. Condition 6 is: and when the carbon quantity C is less than or equal to C0, the carbon quantity reaches a lower threshold value, and the parking regeneration is completed.

On the basis of step S60, when the condition 7 is satisfied, the process returns to step S40. Condition 7 is: t < T3 and C > C0, which represents that at the current temperature, the burn rate is already slow and the particle trap needs to be heated again. Wherein T3 is determined by the carbon content C, and T3 is obtained by looking up table 6.

TABLE 6

C(g)

0～4

4～8

8～12

12～15

15～18

18 or more

T3(℃)

Temperature 1

Temperature 2

Temperature 3

Temperature 4

Temperature 5

Temperature 6

Step S70: and (3) ending the regeneration, controlling the air-fuel ratio to be restored to 1, then reducing the engine speed to a normal idle speed level, and exiting the parking regeneration.

The embodiment of the application also provides a control device for parking and regenerating a particle catcher, and fig. 5 is a block diagram of the control device for parking and regenerating the particle catcher, as shown in fig. 5, the device includes: an acquisition module 51, a comparison module 52 and a generation module 53. The acquisition module 51 is used to acquire a first temperature sensed by the sensor for the particle trap. The comparison module 52 is configured to determine whether the particle catcher meets the post-combustion condition according to the first temperature, and compare the first temperature with a first temperature threshold value to obtain a comparison result when it is determined that the particle catcher meets the post-combustion condition. The generation module 53 generates a control instruction set based on the comparison, the control instruction set for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy includes at least one of: an lean strategy that increases oxygen flow to the engine, an rich strategy that increases fuel to the engine.

Embodiments of the present application also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run. Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of: step S1: a first temperature of the particle trap sensed by a sensor is collected. Step S2: and judging whether the particle catcher meets the post-combustion condition according to the first temperature. And under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result. Step S3: generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the particulate trap, an rich strategy that increases fuel to the engine. The first temperature may be an inlet temperature of the particle trap or an internal temperature of the particle trap, and the specific value of the first temperature threshold is determined by parameters of the engine or carbon deposition amount on the wall surface of the particle trap.

Embodiments of the present application also provide a processor arranged to run a computer program to perform the steps of any of the method embodiments described above. Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program: step S1: a first temperature of the particle trap sensed by a sensor is collected. Step S2: and judging whether the particle catcher meets the post-combustion condition according to the first temperature. And under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result. Step S3: generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the particulate trap, an rich strategy that increases fuel to the engine. The first temperature may be an inlet temperature of the particle trap or an internal temperature of the particle trap, and the specific value of the first temperature threshold is determined by parameters of the engine or carbon deposition amount on the wall surface of the particle trap.

An embodiment of the application further provides an electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the steps of any of the method embodiments described above. Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program: step S1: a first temperature of the particle trap sensed by a sensor is collected. Step S2: and judging whether the particle catcher meets the post-combustion condition according to the first temperature. And under the condition that the particle catcher meets the post-combustion condition, comparing the first temperature with a first temperature threshold value to obtain a comparison result. Step S3: generating a control instruction set based on the comparison result, the control instruction set being for controlling the engine to execute a regeneration strategy, wherein the regeneration strategy comprises at least one of: an lean strategy that increases oxygen flow to the particulate trap, an rich strategy that increases fuel to the engine. The first temperature may be an inlet temperature of the particle trap or an internal temperature of the particle trap, and the specific value of the first temperature threshold is determined by parameters of the engine or carbon deposition amount on the wall surface of the particle trap.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A control method for parking regeneration of a particulate trap, comprising:

collecting a first temperature sensed by a sensor of the particle trap;

judging whether the particle catcher meets a post-combustion condition according to the first temperature;

comparing the first temperature with a first temperature threshold value under the condition that the particle catcher meets the post-combustion condition, and obtaining a comparison result;

generating a control instruction set based on the comparison result, wherein the control instruction set is used for controlling the engine to execute a regeneration strategy, and the regeneration strategy comprises at least one of the following steps: an lean strategy that increases oxygen flow into the engine, an rich strategy that increases fuel into the engine;

wherein a control instruction set for controlling the engine to execute a regeneration strategy is generated based on the comparison result, comprising: generating a first target control instruction in the control instruction set under the condition that the comparison result meets a first preset condition, wherein the first target control instruction is used for controlling an engine to execute the lean strategy so as to adjust the air-fuel ratio of the engine to a first target air-fuel ratio; collecting a first air-fuel ratio and a second air-fuel ratio, wherein the first air-fuel ratio is an air-fuel ratio in a communicating pipeline between a catalyst and an engine, and the second air-fuel ratio is an air-fuel ratio in a communicating pipeline between the catalyst and a particle catcher; and controlling the engine to stop the lean strategy when it is determined that the first air-fuel ratio and the second air-fuel ratio are both equal to the first target air-fuel ratio and the duration of the first air-fuel ratio and the second air-fuel ratio maintained at the first target air-fuel ratio satisfies a first preset duration.

2. The control method according to claim 1, characterized in that a control instruction set for controlling the engine to execute a regeneration strategy is generated based on the comparison result, comprising:

generating a second target control command in the control command set under the condition that the comparison result meets a second preset condition, wherein the second target control command is used for controlling an engine to execute the enrichment strategy so as to adjust the air-fuel ratio of the engine to a second target air-fuel ratio;

collecting a second temperature of the particle trap;

and controlling the engine to stop the enrichment strategy under the condition that the second temperature is determined to be greater than or equal to a regeneration temperature threshold, wherein the regeneration temperature threshold is a temperature value required for carbon deposit combustion in the particle trap.

3. The control method according to claim 2, characterized in that the control method includes:

judging whether the temperature of the particle catcher collected at a first moment and the temperature of the particle catcher collected at a second moment meet a third preset condition or not under the condition that the second temperature is smaller than a regeneration temperature threshold value, wherein the first moment is positioned before the second moment;

if so, the engine is controlled to execute the lean strategy to adjust the air-fuel ratio of the engine to a third target air-fuel ratio.

4. The control method according to claim 2, characterized in that the control method includes:

judging whether the duration of executing the enrichment strategy by the engine at the second target air-fuel ratio meets a fourth preset condition under the condition that the second temperature is smaller than the regeneration temperature threshold value;

5. The control method according to claim 3 or 4, characterized in that the control method includes:

in controlling the engine to execute the lean strategy at the third target air-fuel ratio, generating a third target control instruction in the control instruction set when the second temperature is smaller than the regeneration temperature threshold value, wherein the third target control instruction is used for controlling the engine to execute the rich strategy.

6. The control method according to claim 3 or 4, characterized in that the control method includes:

in the process of controlling the engine to execute the lean strategy at the third target air-fuel ratio, controlling the engine to execute the lean strategy to adjust the air-fuel ratio of the engine to a fourth target air-fuel ratio in the case where the second temperature is greater than or equal to the regeneration temperature threshold;

and detecting the carbon load in the particle trap, and controlling the engine to execute the enrichment strategy under the condition that the carbon load is higher than a carbon amount allowable value and the current second temperature of the particle trap is smaller than a second temperature threshold value.

7. The control method of claim 6, wherein an engine spark advance angle is adjusted to increase a temperature within the particulate trap during control of the engine to execute the lean strategy.

8. A control device for parking regeneration of a particulate trap, comprising:

the system comprises an acquisition module for acquiring a first temperature of a particle catcher sensed by a sensor;

the comparison module is used for judging whether the particle catcher meets a post-combustion condition according to the first temperature; comparing the first temperature with a first temperature threshold value under the condition that the particle catcher meets the post-combustion condition, and obtaining a comparison result;

the generation module is used for generating a control instruction set based on the comparison result, wherein the control instruction set is used for controlling the engine to execute a regeneration strategy, and the regeneration strategy comprises at least one of the following steps: an lean strategy that increases oxygen flow to the engine, an rich strategy that increases fuel to the engine.

9. A computer storage medium, characterized in that the computer storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer storage medium is located to carry out the control method according to any one of claims 1-7.

10. A processor, characterized in that the processor is adapted to run a program, the processor being arranged to run a computer program to perform the control method of any of the claims 1-7.